Crossword Genius

Foreigner held in a vault (4)

Ross

I believe the answer is:

pole

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'foreigner' is the definition.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pole that I've seen before include "National from east" , "One of two opposites" , "European; measure of length" , "Staff" , "European - flag bearer" .)

I've seen this clue in the Evening Standard.
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